Type-writing machine.



No. 855,012. 4 PATENTED MAY 28, 19 07.

' A; F. LEAR.

TYPE WRITING MACHINE. APPLICATION YII'LED APR.1.1907.

- Inventar:

Arthuri'llear I UNITED STATES PATENT OFFICE.

ARTHUR F. LEAR, OF NEW YORK, N. Y., ASSIGNOR TO UNDERWOOD TYPEWRITEROOMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

Patented May 28 1907.

To all whom it may concern: I

Be it known that I, ARTHUR F. LEAR, a citizen of the United States, residin in the borough of Brooklyn, city of New ork, in

the county of Kings and State of New York,

have invented certain new and useful I-mprovements in Type-VVritin Machines, of which the following is a speci cation.

This invention relates to the manner of mounting revoluble platens .of typewriting machines. Said platens are usually journaled in frames which are made very light in order to conduce to speed of operation of the ends of'the frame, except by going through the process of grinding off the end of t e platen hub after the parts have been manu-v actured and are ready to assemble. many cases the platen itself, which consists of a tube of rubber placed upon a wooden core, alters in length after it is manufactured, so that it will not fit accuratel between the ends of the platen frame. or these and other reasons, it is the common practice to make platens a trifle over size and then-to fit them into the laten frame by grinding the platen hubs, w ich is a slow and expensive process.

The object of the. present invention is to provide simple, inexpensive and satisfactory means for securing an accurate fit of the platen in the iplaten frame. To this end, I provide one o the platen heads with an adj ustable hub to fit upon the platen axle. The

hub is exteriorly threaded between its ends,

soas to screw into the platen head more or less as required,so as to take up the play of the platen in the platen frame. Any suitable means such as a nut, may be'used to fasten the hub Upon the outer end of the hub is provided a. set screw to fasten the hub to the axle. The inner .end of 'the' vhub 'exten'ds quite a dis a long bear core 10 having a rubber sheath 11.

heads 12 and 13 are secured upon the core 10 In:

to the platen head after adjustment.

the end of the contiguous bearing in the platen frame. I v

- In the accom anying drawings, Figure 1 is a partial plan 0 the platen frame of an Underwood typewriting machine provided with my improvements; certain of the parts being broken away to illustrate the construc-- .tion. Fig. 2 is a perspective fragmentary view showing the platen axle and the adjustable platen hub thereon. Fig. 3 is a sectional view of the axle and hub. Fig. 4 is an end view of the platen.

In the Underwood typewriting machine, types 1 strike upon the front side of a platen 2 which is secured upon anaxle 3, the latter mounted in journals or bearings 4 in the ends 5, 6' of a platen frame, which also comprises a rear plate or paper shelf 7. The axle 3 projects outside of the platen frame and'carrics hand wheels 8, which are rcleasably secured by set screws 9.

The platen. usually comprises a wooden Metallic .by screws 14. The left hand head 12 has a hub 15 through which passes a set scrw'16 to secure the hub to the axle. The right hand head 13 is provided with-an adjustable hub 17 through the outer end portion 18 of which passes a'similar screwl.) to secure it to the platen axle. It will .be understood that when it is desired to remove the platen, it is 0111 necessary to loosen one of the screws 9 an both of the screws 16 and 19, whereupon the axle, which passes through the hub and through the bearings 4, can be pulled out of the machine, thus releasing the platen.

The hub 17 is slightly enlarged at a'point between its ends, and this enlargement is formed with screw threads 20, to screw into the head 13 which. has a suitably threaded central aperture or socket 21. The inner end of the hub is prolonged to extend far within the platen, as seen atFig. 1, whereby the hub is given a long bearing upon the axle platen frame, the hub 17 is turned outwardly to' adjust it to the righhatlfliggl, to take up the endwise play of the laten in the platen tance within thegplateh, so as to give the hub fr on the axle, so thatthe L'outer bearingsxtin the ends of the platen frame.

ame, or until both hu s 15 and 17 press ilig htly against the inner ends or' faces of the 1 5 with the platen without distur ing the ad- The'screws 16 and 19'may be turned to secure the hubs to the axle, and a nut-22 upon the threaded ortion of the hub 17 may be turned up hrmly against the platen head 13,so as to fasten the hub 17 to the'position to which it has been adjusted relatively to the platen head. r

It will be observed that the adjustable hub aflords inexpensive and readily ap lied means for taking 11 endwise play 0 the platen, and that I avold the necessity of repeatedly removing the platen from the machine for grinding the end of the platen hub and reacin it in the machine or a test until an exact fit is secured. A precise fit of any platen in any suitable platen frame may be secured by a moment s manipulation after the platen is placed in the machine.- When the laten is removed, the adjustment of the hub is not disturbed, so that the platen can be immediately put back and secured without,

the necessity of re-fitting or re-adjusting of a parts.

Having thus described my invention, I claim: 1

1. In 'a typewritin machine, the combi{ nation with a frame aving ends, each pron d f ith a bearing, of a platen having 1* heads, an axle passing through said heads 7 53 and j'ournaled in said bearings, one of said heads being provided with ahub to fit upon said axle, said hub being adjustable longitudinally of the platen, to take up longitudinal .play of the platen between said 7 heads being provided with a hub to fit upon said axle, said hub being adjustable lon itudinally of the platen, to take up lon "tu inal earings, means to secure said hub to its head at different adfustments of the hub, and means outside o the laten, to secure said hub to the axle; the p aten being removable from the frame b withdrawing the axle, and the hub and hu -securing means bein removable justment of the hub. .3. In a typewriting machine, the combination with'a frame aving ends, each provided with a bearing, of a platen having :heads and an axlepassing through said heads and journalediifi said bearings, one of said heads being provided with a hub to fit upon e rt axlee eidi'ls be 's' thteaded i head for adjustment lengitiidinhlly of the I axle passing throu platen, to takeup longitudinal play of the platen between said bearings, means to secure said hub to its head at diiierent adjustments of the hub, and a set screw to secure said hub to said axle; the platen being removable from the frame by withdrawing the axle, and the hub and hub-securing means being removable with the platen without disturbing the adjustment of the hub.

4. In a typewriting machine, the combination with a frame having ends, each provided.

with a bearing, of a platen having heads and an axle passing through said heads and journaled in said bearings, one of said heads be ing providedwith a hub to fit upon said axle, said hub being threaded into its head for adjustment longitudinally of the platen, to take up longitudinal lay of the platen between said bearings; t 1e platen and hub being removable together from the frame without disturbing the adjustment of the hub relatively to the platen.

5. In al-ypewriting machine, the combination with a fr'ame having ends, each provided with a bearing, of a platen havin heads and an axle passing through said hea s and journaledin said bearin s, one of said heads being provided with a ub'to fit upon said axle,

said hub being exteriorly threaded at a point- .between its end portions, to screw into its head, for adjustment longitudinally of the platen, to take up longitudinal play of the platen between said bearings, and means to secure said hub to its head at diiferent adjustments of the hub; the platen andhub being removable to ether from the frame withoutdisturbin t e adjustment of the hub relatively to t e platen.

6. In a typewriting machine, the combination with a frame having ends, each provided with a bearing, of a platen having heads and an axle passing through said heads and journaled in said bearin s, one of said heads being provided with a ub to fit ii on said axle, said hub being exteriorly threar ed'at a point between its end'portions, to screw into its head, for adjustment longitudinally of the platen, to take up longitudinal play of the platen between said bearin s, and means to secure said hub to its hea at different adjustments of the hub; the inner end of the hub projecting within the platen to give a lengthened bearing of the hub on the axle; the platen and hub being removable to gether from the frame without disturbing the adjustment of the hub relatively to the platen. 1

7. In a typewriting machine, the combination with a frame having ends, each provided with a bearing, of a laten having heads, an g said heads and journaled in said bearings, one of said heads being provided witha ub to fit upon said axle, 881d hub being exteriorly threaded at a point between itsend portions, to-screw into its platen-between said bearings, means to secure said hub to its head at difi'erent adjust ments of'the hub, and a set screw threaded into the outer end ofthe hub, to fasten itjto the Sli e; the platen and hub being removable together from the ,framewithout disturbing the adjustment of the hub relatively to the platen. I

8. Ina typewriting machine, the combination with a frame having ends, each provided with a bearing, of a platen having heads, a

- detachable axle having a hand wheel and passing through said heads. and journaled in 4 said bearings, a hub member whereby one of said heads is mounted upon said axle, said the platen and the, hub-member bein movable from the frame Without distur ing hub member mounted for adjustment longitudinally of and relatively to the platen,

means for securing said hub member to its head at different adjustments, and independent means .for securing the platen detachably to the axle, whereby the platen ma be detached from the frame without distur ing the adjustment of said hub member the adjustment of the hub-member'relatively to the platen. 4

ARTHUR F. LEAR. Witnesses: h l

K. FRANKFORT, C. RIPLEY. 

